#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
int main()
{
	char arr1[] = "welcome to xiangtan.";
	char arr2[] = "####################";
	int left = 0;
	int right = strlen (arr1)-1;
	while (left <= right)
	{
		arr2[left] = arr1[left];
		arr2[right] = arr1[right];
		left++;
		right--;
	}
	return 0;
}